In Eclipse, how to copy an existing project to another project?

1. Close Eclipse
2. Copy the folder of existing project to anywhere on your disk.
3. Start Eclipse. Turn off the automatically build.
4. In the Eclipse do Refactor / Rename to the new project name. (If it connected to CVS/SVN disconnect before rename.)
5. Import back the old project from place where you copied in the second step.
6. Turn on the automatically build.

Enjoy them!

This question appears in Google search as top result for query "copy project in eclipse".

To copy project in Eclipse:

1) right click on project in Package Explorer view;

2) choose Copy;

3) right click on free place in Package Explorer view;

4) choose Paste;

5) enter new name in the prompt window.

To answer actual question, the best way is to delete project B and after -- copy project A as explained above and give it name B.